linux-kernel - Re: Extremely slow IO with a PCMCIA CompactFlash adapter

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Date:	Sat, 01 Aug 2009 12:32:40 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Jack Byer <ojbyer@....net>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Extremely slow IO with a PCMCIA CompactFlash adapter

On 08/01/2009 08:02 AM, Jack Byer wrote:
> I have an old digital camera that stores its pictures on a 340 MB IBM
> microdrive. I am trying to transfer to pictures from the camera to my
> computer but can not find the special non-standard USB cable. The
> camera did come with a CompactFlash to PCMCIA adapter, so tried
> connecting it to my laptop. I was able to install the correct modules
> and mount the drive, but accessing it is very slow (5.0 kBps read /
> 3.8 kBps write). Is this expected behavior? Is there any setup I am
> missing that would make this faster?
>
> Kernel version is 2.6.30.3
>
> pccardctl ls:
>
> Socket 0 Bridge:        [yenta_cardbus]         (bus ID: 0000:00:0a.0)
> Socket 0 Device 0:      [pata_pcmcia]           (bus ID: 0.0)
>
> pccardctl info:
>
> PRODID_1="IBM"
> PRODID_2="microdrive"
> PRODID_3=""
> PRODID_4=""
> MANFID=00a4,0000
> FUNCID=4
>
> time output to write a 1 MB file to the drive:
>
> real    4m29.476s
> user    0m0.000s
> sys     0m0.000s
>
> time output to read a 1 MB file from the drive:
>
> real    3m25.600s
> user    0m0.000s
> sys     0m0.000s
>
>
Can you post the dmesg output from detecting the device?
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